Sound reproducing system



Nov. 3, 1931. w. c. JONES I SOUND REPRODUCING SYSTEM Filed Feb. 21. 1929I Ha I.

INVENTOR- W. C. dorms ATTORNZY Patented Nov. 3, 1931 l UNITED STATESPATENT OFFICE,

WARREN O. J' ONES, OF FLUSHING,'NEW YORK, ASSIGNOR TQBELL TELEPHONELABORA- TORIES, INGOBPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK scum) mnonocmc sYs'rEu Application filed rem-nar 2i, 1929. SerialNo. 341,612.

This invention-relates to sound reproducing systems wherein therecorded'sounds are reproduced directly from the original recordingmedium and has for its ject the improvement of the quality ofreproduction from such records.

When makin sound records it is usually necessary or at Ieast desirableto experiment to some extent before attempting to make a 1o finalrecord. It has been common practice heretofore to record on two soft waxrecord blanks and to play back one of these to determine if the soundshave been recorded satisfactorily. This procedure, however, not damagesone of the records but also fai s to give a true'rendition of the soundsactually recorded since, due to the resiliency of the record material,the stylus does not follow. the groove faithfully, particularly at I 2high frequencies.

n accordance with this invention a more 1 v faithful reproduction of allthe recorded sounds is obtained without damaging the soft wax record toany appreciable extent by ap-.

plying to the record a stream of liquid air or other cooling substancesomewhat in advance of the reproducing stylus. In this manner thenormally yieldm surfaces of the grooves are temporarily hardened andmade capable of offering suificient reaction to the reproducing stylusfor the proper operation of the play-back reproducer.

A clearer understanding of the invention may be obtained from thefollowing detailed specification and the accdmpanying drawings in whichFig. v1 shows a recording and re producing system incorporating thisinvention, and Fi 2 is a detailed view of the arran ement o the coolingsystem with respect 49 to t e reproducing stylus.

v Referring to the drawings 24 is the main supporting arm for therecording and reproducing mechanisms 2 and 3 respectively and forms apart of a recording machine such as that disclosed in Patent No.1,711,650

- granted to HQPfannenstiehl, May 17, 1929.

This arm as shown in the .Pfannenstiehl pat- I cut is mounted adjustablyon a carria e so that it ma be moved up or down by a and 50- operatedcad screwin the usual manner.

The carriage is driven horizontally by a lead I screw driven by theturntable motor so that when the machine is in. operation the recordingand reproducing mechanisms are moved radially with respect to therecordat the proper speed. Independent vertical adjust- 'ment for thereproducing mechanism 3 is provided by hand wheel 4 so that thismechanism may be utilized to reproduce a portion of the record withoutdisturbing the recorder adjustment. This'latter feature is more fullydescribed and claimed in a co.- pending application of J H. Saillaird,Serial No. 333,731, filed January 19, 1929 and assigned to the sameassignee as the present application.

Associated with the reproducing mecha nism is the cooling systemcomprising this invention which consists of a nozzle 5 secured 1 to thereproducer arm 11 by screws 12 12' and terminating near'the surface ofthe record slightly in advance of the reproducing needle 7. This nozzleis connected to the tankor reproducer 8 containing the liquid air orother cooling substance by means of a flexible hose connection 9.

When it is desired to play back a portion 'of the wax record 6 which hasjust been recorded by the mechanism 2, the main arm 24 and the screwmechanism 4 are adjusted to bring the reproducing mechanism 3 intoplaying position. The va ve 10 is adjusted to give the proper flow ofcooling liquid so that the record surface immediately in front of the areproducer engaging the record, and means efiective in advance of thereproducer for hardening'a portion of the surface of the record. p

2'. In a sound reproducing system, a record, a reproducer engaging therecord, and means 5 effective in advance of the reproducer for ternorarily hardening the surface of the recordi lefore reproduction.

' 3. In a sound reproducing system, a soft wax record, a reproducerengaging the record,

' and means for applyln a coohng stream to the surface of the recor inadvance of the reproducer.

4; In a sound e reducing system, a soft wax record, a repro ucerengagingthe record,

v and means for applying a stream of liquid air to the surface of therecord in advance of the reproducer.

In witness whereof, I hereunto subscribe my name this 19th day ofFebruary, 1929.

WARREN o. JONES.

